<title>AM Detector</title>
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<applet code=Circuit.class archive=circuit.jar width=640 height=450>
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<param name=pause value=20>
<param name=startCircuit value="amdetect.txt">
<param name=startLabel   value="AM Detector">
<param name=useFrame     value="false">
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<p>
This is a "<a
      href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/amfmdet.html#c1">crystal
      radio</a>",
an AM radio receiver with no amplifier.<span style="mso-spacerun:
      yes">&nbsp; </span>The raw antenna feed is shown in the first scope slot
      in the lower left.<span style="mso-spacerun: yes">&nbsp; </span>The
      inductor and the capacitor C1 are tuned to 3 kHz, the frequency shown in
      the lower right as "res.f".<span style="mso-spacerun: yes">&nbsp;
      </span>This picks up the carrier wave shown in the middle scope
      slot.<span style="mso-spacerun: yes">&nbsp; </span>A diode is used to
      rectify this, and the C2 capacitor smoothes it out to generate
      the broadcast
      signal in the last scope slot (which is simply a 12 Hz sine wave in this
      example).<span style="mso-spacerun: yes">&nbsp; </span>By experimenting
      with the value of C1's capacitance, you can pick up two other "stations"
      at 2.71 kHz and 2.43 kHz.

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<br>Generated Tue Dec  7 2010
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